body{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgb(15,182,245);
    .content{
        width: 800px;
        height: 100%;
        margin: 20px auto 0;
        background: rgb(50,245,183);
    
    }
}
